Impacting tool



Aug. 3l 1926. 1,598,090

J. LARoccA IMPACTING TooL Filed August 2:5, 1924 /6 i Patented Aug. 31, 1926. A

UNITED sTATEs PATENT i .1,598,090 OFFICE.

nuns muiocca,y or cIcEno, ILLINOIS, assrcnon To ELECTRO-MAGNETIC Toor. con- PANY, OF CICEBO, ILLINOIS,

A. CORPORATION OF ILLINOIS.

IMPACTING TOOL.

application mea august 23, 1924'. l serial no. 733,749.

I My invention is a mechanical movement finding useful employment 'in various ways,

, the mechanism of my invention being of p particular service when employed in the operating mechanism of an impacting tool.

The mechanism of my invention includes a rotatable carrier, a plunger carried thereby, means for moving the plunger to one position with reference to the carrier, an

abutment positioned to be engaged by the -pl-unger w en in this position, and mecha nism for effecting movement of the plungerv l `with reference to the carrier to an alterna-A tive and abutment escaping position consequent upon the engagement of the plunger and abutment. In the preferred embodiment of the invention a spring is employed to restore the plunger to` that position upon 'the carrier lin which the plunger is engage.- able with the abutment, which abutment may be the shankofa drill or rivet set. Asthe mechanism is. preferably constructed, an electric motor. and /suitable transmission gearing are employed to rotate thecarrier and strike the plunger upon the abutment.

The plungeris desirably so related to the carrier and abutment thaty a side of the plunger strikes the abutment, the abutment escaping movementof the plunger being ap- *3.0- proximately at right angles to the abutment -striking direction' of the plunger. The

. spring serves as a exible or resilient link or medium between the' motor driven transmission gea'ring'and the carrier, the'jspring thus functioning through the plunger. When the carrier is moved from rest after each impact, its speed is accelerated by the spring in which power is absorbed or stored for this purpose as the' plunger is withdrawn o from'the abutment against the force of the springl In the preferred embodiment of the invention the plunger and carrier rebound after strikin the. abutment, in a direction opposite to te abutment striking movement 5 of' the plunger and carrier. .There isthus aii'orded a space between the plunger and abutment that permits the plunger to be withdrawn into the carrier by the motor to thereby escape the abutment as the plunger 0 -and carrier recover from the rebound, whereby wearin engagement of plunger and abutment is re uced. The invention will be more fully explained in connection with the accompanying drawing in which Fig. 1 is a side view, with a casing Ycover removed, of the preferred form of my inventlon as embraced in an impact- Ing tool; 'F1g.2 is a sectional view on line 2.--2 of Fig. 1 Fig. 3 is a sectional view on line 3 3 of ig. 1 with partsshown in full;-and Fig. 4 1s a view somewhat similar yto Elg. 1 but showing a lesser portion, the carrier and lungers bein shown withdrawn-from t e abutment, t e carrier being also shown in section.

I he operating shaftl ma be driven by any suitable means. In the rawingsI have illustrated an electric motor 2 brought into ldriving relation with this shaft through the intermediation of a spur pinion 3 upon the v -motor shaft and a spur gear 4 upon the operating shaft. The operating shaft functions through any suitable means, such as a spur pinion 5 fastened upon the shaft by a pin 6. p

The annular carrier 7 has/a hub portion by which this carrier is journaled upon the `shaft l to be capable of turningin the course of operation both with respect to and in the direction of-lthis shaft and the pinion 5 fast upon the shaft. The'plunger mechanism is shown as including .two plungers 8 and 9, each in the form ofa rack in mesh with op posite sides of the common pinion 5. The invention, however, is not to be thus limited. These' racks are movable upon and travel bodily with the carrier. Springs 10,-11 are interposed between the carrier and racks and .serveywhen free to act, to place the racks lin their outer positions definedby a suitable stop such as the casing 14. An abutment 12 is positioned within the circle of rotation of the outer ends ofthe racks when these racks are in their outer positions, whereby the sides of the racks successively strike -the abutment as the carrier is given rapid intermittent/turning movements in the direction of. the shaft and inion. -The invention is illustrated as being embodied in an impacting tool in which the abutment is the butt or striking end of a drill 13 which passes through a. casing 14 that houses the carrier and other parts, to project Vinto the interior carried by the casing upon Vits exterior. For

convenience the casinar isA formed with an extension 16 constituting a handle for the device if it is to be of portable and manipulatable form,

In operation, the shaft 1 is driven at a substantially constant speed by the motor, through the intermediation of the gearing 3, 4. Assuming the device to be in the stage of operation illustrated, the pinion 5, fixedly coupled at 6 with the shaft, draws the racks or plungers 8, 9 inwardly against the force of the springs 10, 11 until the rack 9 escapes engagement with the abutment, whereupon the springs force the racks rapidly outward to a point limited by the stop, in this instance the casing 14. The carrier and racks are thereafter turned until the ,side of the rack 8 at the outer end thereof strikes the abutment 12 whereupon thel rack 8 is operated u on and operates as described in the case o rack 9.

As I have embodied my invention, one function of the springs is to place the plungers 8 and 9 in their outer, abutment striking, position upon and with respect to the carrier. A secondary function is to provide a flexible or resilient link or medium between the driving motor and the driven carrier so that when the carrier is started from rest, as it is after each impact, the accelerating force is transmitted, absorbed or stored and gradually applied to the carrier by the springs. Now when the carrier is rotating the plungers while in their outer positions at high tool operating speeds and a plunger strikes the abutment 12, the carrier and the plungers not only stop, but they rebound. The direction of the rebound being against the direction of rotation of the pinion, the real velocity of the pinion in respect to the rack is the sum of the inions speed in one direction and the carrier s speed in the reverse direction. The result is that the plungers or racks are pulled back into the carrier at the rate which is the sum of the pinion speed and the recoil speed and is very quick. vThe striking plunger in being pulled rapidl inward while in rebound, escapes the a utment to prevent or lessen any dragging action or half hitting which spawls or drags over the metal of either or both of these elements if allowed. After the springs have been compressed or rather while being compressed the carrier and the plungers are being accelerated by and in the direction of rotation of the` pinion, and as the plungers approach the same speed as the pinion, the energy stored in the springs acts to accelerate the carrier. The added accelerating force must give the carrier a speed in excess of the pinion speed and allow the springs to take their normal positions and the striking elements their normal positions.

to the abutment and in actuating relation to the plunger, for effecting movement of the lunger with reference to the carrier to an a ternative and abutment escaping osition consequent upon the'engagement ok the plunger and abutment.

2. he combination with a rotatable carrier; of a plunger carried thereby and coupled therewith; means for moving the plunger to one position with reference to the carrier; an abutment positioned to be engaged by a side of the plunger when in this osition; and mechanism, supplied in addition to the abutment and in actuating relation to the plunger for effecting movement of the plunger with reference to the carrier to an alternative and abutment escaping position consequent upon the engagement of the plunger and abutment. A

3. The combination with a rotatable carrier; of a plunger carried thereby and coupled therewith; a spring interposed between the carrier and plunger for moving the plunger to one position with reference to the carrier; an abutment positioned to be engaged by the plunger when in this position; and mechanism, supplied in addition to the abutment and in actuating relation to the plunger, operating against the force of the spring for effecting movement of the plun er with reference to the carrier to an a ternative and abutment escaping position consequent upon the engagement of the plunger and abutment.

4. The combination with a rotatable carrier; of a plunger carried thereby and coupled therewith; a spring interposed between the carrier and plunger for moving the plunger to one position with reference to the carrier; an abutment positioned to be engaged by a side of the plunger when in this osition; and mechanism, supplied in addition to the abutment and. in actuating relation to the plunger, operating against the force of the spring for eiecting movement of the plunger with reference to the carrier to an alternative and abutment escaping position consequent upon the engagement of the lunger and abutment.

5. The com ination with a rotatable carrier; of means for rotating the carrier; a yielding power transmitting element between the carrier and said means; an abutment; a plunger upon and coupled with the carrier and positioned to en a the abutment; and mechanism, supplie in addition to the abutment and in actuating relation to the plunger, for effecting movement of the plunger with reference to the carrier to an alternative and abutment escaping position consequent upon the engagement of thev plun er and abutment.

`6. he combination with a rotatable carrier; of means for rotating the carrier; a yielding power transmitting element between the carrier and said means; an abutment; a plunger upon and coupld with the carrier and positioned thereon to have a side engage- 7. The combination with a rotatable carrier; of means for rotating the carrier; a power transmitting spring between the carrier and said means; an abutment; a plung- .'er upon and coupled with the carrier and positioned to engage the abutment; and mechanism, supplied in addition to the abutment and in actuating relation to the plunger, for effecting movement of the plunger with reference to the carrier to an alternative and abutment escaping position consequent upon the engagement f the plunger andabutment.

8. The combination with a rotatable carrier; of means for rotating thecarrier; a power transmitting sprin between the oarrier and said means; an a utment; a plunger upon and coupled with the carrier and positioned thereon to have a side engage the abutment; 'and mechanism, supplied in addition to the abutment and in actuating relation to the plunger, for effecting movement of the plunger with reference to the carrier to an alternative and abutment escaping position consequent upon the engagement of the plunger and abutment.'

9. The combination with a rotatable carrier; of a rack carried thereby; a driving pinion in mesh with the rack; means for moving the rack to one position with reference to the carrier; and an abutment positioned to be engaged by the rack when in this position, said pinion serving to move the rack from abutment engaging position consequent upon the engagement of the racli:l

and abutment.

10. Thecombination with a rotatable carrier; of a rack carried thereby; a driving pinion in mesh with the rack; a spring interposed between the rack and carrier for moving the rack to one position with reference to the carrier; and an abutment positioned to be engaged by the rack when in this position, said pinion serving to move the rack from abutment engaging position against' rier; of a rack carried thereby; a driving pinion in mesh with the rack'; means for moving the rack to one osition with reference to the carrier; an an abutment positioned to be engaged by a side of the rack when in this position, said pinion serving to move the rack from abutment engaging position conse uent upon the engagement of the rack and a utment.

12. The combination with a rotatable carrier; of a rack carried thereby; a driving pinion in mesh with the-rack; a spring interposed between the rack and carrier for moving the rack to one position with reference to the carrier; and an abutment positioned to be engaged by a side of the rack when in this position; said pinion serving to move the rack from abutment engaging position against the force ofthe s ring consegiuent upon the engagement o the rack an abutment. l

13. The combination with a rotatable carrier; of a plunger carried thereby and coupled therewith; means for moving the plunger to one position with reference to the carrier; an abutment positioned to lbe engaged by the plunger when in this position, said plunger rebounding from the abutment; and mechanism, supplied in addition to the abutment and in actuating relation to the plunger, for effecting movement of the plunger with reference to the carrier toward an alternative and abutment escaping position consequent upon the engagement of the plunger and abutment and while the plunger is out of engagement with the abutment in rebounding therefrom.

14. The combination with a rotatable carrier; of a plunger carried thereby and coupled therewith; means for moving the plunger to one osition with reference to the carrier; an a utment positioned to be engaged by a side of the plunger when in this position, said plunger rebounding from the abutment; and mechanism, supplied in addition to the abutment and in actuating relation to the plunger for eil'ecting movement of: the plunger with reference to the carrier toward an alternative and abutment escaping position consequent upon the engagement of the plunger and abutment and While the plunger is out of engagement with the abutment in rebounding therefrom.

15. The combination with a rotatable carrier; of a plunger carried thereby and coupled therewith; a sprin'g interposed -between the carrier and plunger for moving the plunger to one position with reference to the carrier; an abutment positioned to be engaged by the plunger when in this position, said plunger rebounding from the abutment;

plunger to one position with reference to the l carrier; an abutment positioned to be engaged by a side of the plunger when in this position,'said lun er rebounding from the abutment; an mec anism supplied in addi-1 -tion tothe abutment and in actuating relation to the plunger, operating against the force of the spring for effectlng movement of the plunger with reference to the carrier toward an alternative and abutment escaping position consequent u on the engagement of the plunger and) abutment and while the plunger is out of en agement with the abutment 1n rebounding ierefrom.

In witness whereof. I hereunto subscribe my name. y

JAMES LROCCA, 

